JP2001158333A - Wiper blade rubber and wiper blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide wiper blade rubber capable of enhancing wiping performance. SOLUTION: A waist section 7e provided to continue with a lip section 7f has its wall thickness set such that the collapse angle of the lip section 7f is longitudinally uniform.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper blade rubber for wiping a surface of a glass or the like of a vehicle, and a wiper blade provided with the wiper blade rubber.

[0002]

2. Description of the Related Art One of such wiper blades is shown in FIG.
There is a tournament type wiper blade 51 as shown in FIG. Such a wiper blade 51 is provided with the wiper arm 5
Primary lever 53 rotatably connected to the tip of 2
A secondary lever 54 rotatably connected to both ends of the primary lever 53, and a yoke 55 rotatably connected to both ends of each secondary lever 54. At both ends of each yoke 55, claw portions 55a for holding the wiper blade rubber 56 are provided. The spring (not shown) of the wiper arm 52
Is applied to the wiper blade rubber 56 from the claw 55a of each yoke 55 via each lever 53, 54 as a pressing force on the glass surface.

As shown in FIG. 6, the wiper blade rubber 56 includes a base portion 56a held by a claw portion 55a and a wiping portion 56b for wiping the glass surface. Base 56a
In order to disperse the pressing force applied from each claw portion 55a in the longitudinal direction of the wiper blade rubber 56, a pair of plate-like backings 57 are attached along the longitudinal direction. On the other hand, the wiping portion 56b has a cross section including a neck portion 56c, a shoulder portion 56d, a waist portion 56e, and a lip portion 56f,
The neck portion 56c is formed to be narrow and has a base portion 56a and a wiping portion 56b.
And are connected continuously and integrally. The shoulder 56d contacts the lower surface of the base 56a to determine the maximum tilt angle of the wiping unit 56b. The waist 56e is formed in an inverted triangular shape continuous with the shoulder 56d, and the lip 56f is provided continuously with the waist 56e to wipe the glass surface. Such a wiper blade rubber 56 has been formed to have the same cross-sectional shape in the longitudinal direction as before.

However, in the longitudinal direction of the wiper blade rubber 56, the above-described pressing force is high near the claw portions 55a and low between the claw portions 55a, and cannot be uniformly distributed. That is, the inclination angle of the lip portion 56f with respect to the glass surface (the contact angle between the glass surface and the lip portion 56f)
Is small at the claw portions 55a and large between the claw portions 55a, and is not uniform in the longitudinal direction of the wiper blade rubber 56, so that wiping unevenness easily occurs. Further, since the falling angles are different, the wiper blade rubber 56 having the same cross-sectional shape in the longitudinal direction has a problem that the lip portion 56f comes into contact with the glass surface in a wave form, which further promotes wiping unevenness. Was.

Therefore, in order to solve the above problem, the claw 5
Either the lower surface of the base 56a or the shoulder 56d is protruded to the other side so that the distance between the lower surface of the base 56a and the shoulder 56d between 5a becomes narrower, and the wiping portion 56b between the claws 55a.
There is a method in which the entire inclination angle is set to be larger than that of the claw portion 55a, and the contact pressure of the lip portion 56f with respect to the glass surface is made uniform in the longitudinal direction (Japanese Patent Laid-Open No. 6-17)
1471).

[0006]

However, in such a wiper blade rubber, although the contact pressure is made uniform in the longitudinal direction, the lip portion 56 between the claw portions 55a is provided.
Since the falling angle of f is larger than the desired angle, the falling angle differs between the portion having the protrusion and the portion having no protrusion. Therefore, the lip portion 56f of the wiper blade rubber
However, the problem that the glass is deformed into a waveform in the longitudinal direction and comes into contact with the glass surface, thereby causing uneven wiping, is still not solved.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a wiper blade rubber and a wiper blade capable of improving wiping performance.

[0008]

In order to solve the above problems, according to the first aspect of the present invention, a lip portion for wiping a glass surface and a cross section is gradually narrowed toward the lip portion. In the wiper blade rubber, which has a waist portion and a pressing force is applied to a glass surface side of a size that is partially different in the longitudinal direction, the falling angle of the lip portion due to the pressing force is made uniform in the longitudinal direction. The thickness of the waist in the cross section was set.

According to a second aspect of the present invention, in the wiper blade rubber according to the first aspect, a thickness of the waist portion is reduced.
In accordance with the pressure distribution in the longitudinal direction of the pressing force, a region where the pressing force is high is set thick, and a region where the pressing force is low is set thin.

According to a third aspect of the present invention, in the wiper blade rubber according to the second aspect, the first region where the pressing force is high and the first region where the pressing force is low are arranged in the longitudinal direction according to the pressure distribution. 3 and a second region located between the first and third regions and having a moderate pressing force. The waist has a thickness of the first and third regions. In the second region, the thickness was reduced in accordance with the pressing force, and in the second region, the thickness was gradually reduced from the first region toward the third region.

According to a fourth aspect of the present invention, there is provided a wiper blade provided with the wiper blade rubber according to any one of the first to third aspects. According to a fifth aspect of the present invention, the lever assembly, which is constituted by a plurality of levers rotatably connected to each other, holds the wiper blade rubber for wiping the glass surface and is connected to the tip of the wiper arm. The wiper blade has a biasing force applied to the wiper blade rubber as a pressing force on the glass surface side via the lever assembly. The lever assembly has a plurality of claws for holding the wiper blade rubber. Are provided at intervals in the longitudinal direction of the wiper blade rubber,
A lip portion for wiping the glass surface, and a waist portion having a cross section gradually narrowed toward the lip portion, wherein a thickness of the waist portion in the cross section in a predetermined region between the claw portions is set to the claw portion. Was set to be thinner than

Therefore, according to the first aspect of the present invention,
The thickness of the waist provided continuously to the lip is set so that the inclination angle of the lip is uniform in the longitudinal direction. With this configuration, the contact portion of the lip portion with the glass surface is prevented from being deformed into a waveform in the longitudinal direction due to the difference in the inclination angle, and the occurrence of uneven wiping and jumping (chatter) is suppressed,
Wiping performance is improved.

According to the second aspect of the present invention, the thickness of the waist portion is set thicker in a region where the pressing force is high in accordance with the longitudinal pressure distribution of the pressing force applied to the wiper blade rubber, and The region where the pressing force is low is set to be thin. In this case, even if a different pressing force is applied in the longitudinal direction of the wiper blade rubber, the inclination angle of the lip portion is made uniform within a desired angle range, and the wiping performance is further improved.

According to the third aspect of the present invention, in the first region where the pressing force is high and the third region where the pressing force is low, the waist has a constant thickness in the region corresponding to the pressing force. In the second region between the first and third regions, the waist portion is formed such that the thickness gradually decreases from the first region toward the third region. By doing so, the blade rubber can gradually change the rigidity of its waist in the longitudinal direction.

According to the invention described in claim 4, according to claim 1 of the present invention,
According to the wiper blade rubber according to any one of to 3,
Even if a pressing force is applied to the glass surface having a size that is partially different in the longitudinal direction, the falling angle of the lip portion of the rubber is made uniform in the longitudinal direction, so that wiping unevenness and flying (chattering) occur.
Is suppressed, and the wiping performance is improved.

According to the fifth aspect of the present invention, in the wiper blade rubber, in a predetermined region between the claw portions of the lever assembly holding the rubber, the waist portion provided continuously with the lip portion has a claw thickness. It is set to be thinner than the wall thickness at the part. With this configuration, even if a different pressing force is applied from the claw portion of the lever assembly in the longitudinal direction of the wiper blade rubber, the inclination angle of the lip portion of the rubber is uniformed in the longitudinal direction, so that the wiping is performed. Irregularities and jumps (chatters)
Is suppressed, and the wiping performance is improved.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a vehicle wiper. The vehicle wiper 1 includes a wiper arm 2 that is reciprocated by a motor (not shown), and a wiper blade 3 that is connected to a tip of the arm 2 and wipes a glass surface of a windshield. The wiper arm 2 has a spring K
Thus, an urging force as an arm pressure is applied. The wiper blade 3 has a lever assembly S configured in a tournament type by a primary lever 4, two secondary levers 5, and four yokes 6. That is, in the lever assembly S, the primary lever 4 is rotatably connected to the end of the wiper arm 2, the secondary lever 5 is rotatably connected to both ends of the primary lever 4, and the secondary lever 5 is connected to both ends of each secondary lever 5. The yokes 6 are respectively connected rotatably.

As shown in FIGS. 1 and 2, each yoke 6 is provided at each end with a claw section 6a having a substantially U-shaped cross section.
FIG. 3A shows the same length as the wiper blade rubber 7 and FIG.
A backing 8 having a substantially U-shaped cross section is attached as shown in FIG. The backing 8 holds the wiper blade rubber 7 and disperses the pressing force applied to the glass surface from each claw 6 a by the urging force of the wiper arm 2 via the lever assembly S in the longitudinal direction of the rubber 7. Provided for. The backing 8 has flexibility so that the wiper blade rubber 7 follows the curvature of the glass surface.

As shown in FIG. 3, the wiper blade rubber 7 comprises a base 7a held by a backing 8 and a wiping portion 7b for wiping the glass surface. This wiping part 7b
Has a neck 7c, a shoulder 7d and a waist 7e in its cross section.
And a lip portion 7f. The neck portion 7c is formed to be narrow and continuously and integrally connects the base portion 7a and the wiping portion 7b. The shoulder 7d contacts the lower surface of the backing 8 to determine the maximum inclination angle of the wiping unit 7b. The waist 7e is a shoulder 7d.
The lip portion 7f is provided continuously with the waist portion 7e, and the tip portion that contacts the glass surface is formed linearly in the longitudinal direction.

As shown in FIGS. 2 and 3, the wiper blade rubber 7 has a waist 7e between the claws 6a according to the pressure distribution of the pressing force applied from the claws 6a via the backing 8. Is formed thinner with respect to the waist 7e near the claw 6a.

More specifically, the wiper blade rubber 7 is
In accordance with the pressure distribution of the pressing force, the pressing force is roughly divided into three regions A1 to A3 in the longitudinal direction. First, in the first region A1 where the pressing force is high near the claw portion 6a, the waist portion 7e is formed to be thick, and in the region A1, the waist portion 7e is formed to have a constant thickness. In the second region A2, the waist portion 7e is formed so as to gradually decrease from the thickness of the first region A1 as the waist portion 7e moves away from the claw portion 6a, and the distribution of the pressing force is also the center between the claw portion 6a and the claw portion 6a. It becomes smaller gradually toward. Then, the third region A3 (the claw portion 6a) is separated from the claw portion 6a and has a low pressing force.
a), the waist 7e is in the second area A2.
It is formed as thin as the end portion and has a constant thickness in the area A3.

That is, as described above, the first area A1
By making the waist portion 7e thinner from (near the claw portion 6a) to the third region A3 (center portion between the claw portions 6a), the root portion of the lip portion 7f extends. As described above, in the present embodiment, the bending rigidity of the waist portion 7e and the lip portion 7f in the wiping direction from the first region A1 (near the claw portion 6a) to the third region A3 (the center portion between the claw portions 6a). Is gradually reduced.

Then, the first area A1 shown in FIG.
The inclination angle θ1 of the lip 7f at (near the claw 6a)
And the inclination angle θ2 of the lip portion 7f in the third region A3 (the center portion between the claws 6a) shown in FIG. 6B, both within a desired angle range (a range of 30 ° to 50 ° is preferable). The thickness of the waist portion 7e is set for each of the regions A1 to A3 so that the difference between the waist portions 7e is reduced. And such a wiper blade rubber 7 is formed by a mold.

Thus, in the wiper blade rubber 7 of the present embodiment, the thickness of the waist portion 7e near the claw portions 6a and between the claw portions 6a is set in accordance with the pressure distribution of the pressing force applied to the rubber 7. In the claw portion 6a with high pressing force, the thickness of the waist portion 7e is increased to increase rigidity, and in the central portion between the claw portions 6a with low pressing force, the thickness of the waist portion 7e is reduced to reduce rigidity. That is, as a result, the high rigidity portion is pressed with a high pressing force, and the low rigidity portion is pressed with a low pressing force, so that the inclination angle θ1,
θ2 can be made uniform without causing waveform deformation in the longitudinal direction of the wiper blade rubber 7. Therefore, with such a wiper blade rubber 7, the occurrence of uneven wiping and flying (chatter) can be suppressed, so that the wiping performance is improved and the glass surface is always satisfactorily wiped.

As described above, according to the present embodiment,
It has the following effects. (1) The thickness of the waist portion 7e is set so that the inclination angles θ1 and θ2 of the lip portion 7f are uniform in the longitudinal direction. Therefore, the contact portion of the lip portion 7f with the glass surface has a tilt angle θ.
It is possible to prevent the waveform from being deformed in the longitudinal direction due to the difference between 1 and θ2. As a result, the occurrence of uneven wiping and flying (chatter) can be reliably suppressed, and the wiping performance can be improved.

(2) The thickness of the waist portion 7e is set according to the longitudinal pressure distribution of the pressing force applied to the wiper blade rubber 7. Therefore, occurrence of uneven wiping and jumping (chatter) can be reliably suppressed.

(3) The thickness of the waist 7e is set for each of the plurality of regions A1 to A3 provided in the longitudinal direction according to the pressure distribution. Therefore, since the dimension setting only needs to be performed for each of the areas A1 to A3, the setting is easy.

(4) In the first area A1 where the pressure is high and the third area A3 where the pressing force is low, the thickness of the waist 7e is
1 and A3, a second region A2 formed between the first and third regions A1 and A3 with a constant thickness corresponding to the pressing force.
Thus, the waist portion 7e is formed so that the thickness thereof gradually decreases from the thickness in the first region A1 to the thickness in the third region A3. Therefore, the blade rubber 7 can be formed in a simple shape. Moreover, in the second region A2, the rigidity of the waist portion 7e can be gradually changed in the longitudinal direction.

(5) The waist 7e has a neck 7c, a shoulder 7d,
Unlike the lip portion 7f, since it is not a portion that greatly affects the wiping performance due to a subtle change in size, the size can be easily set.

The embodiment of the present invention may be modified as follows. In the above-described embodiment, the thickness of the waist 7e is set according to the pressure distribution of the pressing force applied to the wiper blade rubber 7, but, for example, the waist 7e is set according to the distance from the claw 6a.
May be set. The thickness of the waist portion 7e may be set in consideration of the curvature of the glass to be wiped, a difference in peripheral speed due to a difference in distance from the rotation axis of the wiper arm 2, and the like.

In the above embodiment, the wiper blade rubber 7 is divided into three regions A1 to A3 in the longitudinal direction, and the thickness of the waist portion 7e is set for each of the regions A1 to A3. It is not limited. Further, the thickness may be set according to the pressing force of the waist portion 7e in a stepless manner without particularly setting the region.

In the above embodiment, the waist 7e is formed to have a constant thickness in the first and third regions A1 and A3, and in the second region A2 from the first region A1 to the third region. Although gradually decreasing toward the region A3, the present invention is not limited to this configuration. For example, the first and third areas A
The wall thickness of the waist portion 7e in A1 and A3 may be gradually changed. Further, the thickness of the waist portion 7e in the second region A2 may be a constant thickness.

In the above embodiment, the base 7a and the neck 7
Although c, the shoulder 7d and the lip 7f are shaped as shown in FIG. 3, the shape is not limited to this. In the above-described embodiment, the wiper blade rubber 7 is attached to the claw portion 6a via the backing 8 having a substantially U-shaped cross section. The backing 57 may be used to directly attach the wiper blade rubber to the claw portion.

In the above embodiment, the wiper blade 3 is formed in a tournament manner by the primary lever 4, the two secondary levers 5, and the four yokes 6, but the present invention is not limited to this configuration. For example, the numbers of the secondary levers 5 and the yokes 6 are not limited thereto. Further, the shapes of the primary lever 4, the secondary lever 5, and the yoke 6 are not limited to the shapes shown in FIGS. Further, a wiper blade having a configuration other than the tournament type may be used.

In the above embodiment, the wiper blade rubber 7 is used for the vehicle wiper 1 for wiping the windshield of the vehicle, but may be used for the wiper for wiping glass other than the windshield. Further, a wiper for wiping glass other than the vehicle may be used.

[0036]

As described in detail above, according to the present invention,
A wiper blade rubber and a wiper blade capable of improving wiping performance can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic view illustrating a wiper blade according to an embodiment.

FIG. 2 is an enlarged view of a main part of a wiper blade.

FIG. 3 is a sectional view taken along line BB of FIG. 2;

FIG. 4A is a cross-sectional view showing a wiping state of a thick part at a waist, and FIG. 4B is a cross-sectional view showing a wiping state of a thin part at a waist.

FIG. 5 is a schematic view showing a conventional wiper blade.

6 is a sectional view taken along the line CC of FIG. 5;

[Explanation of symbols]

2 Wiper arm, 4 Primary lever as lever, 5 Secondary lever as lever, 6 Yoke as lever, 6a Claw, 7 Wiper blade rubber, 7e Waist, 7f Lip, A1 to A3 … First
Third region, S: lever assembly, θ1, θ2: falling angle.

Claims (5)

[Claims] 1. A lip portion for wiping a glass surface, and a waist portion having a cross-section gradually narrowing toward the lip portion, and pushing a glass surface having a size that is partially different in a longitudinal direction. A wiper blade rubber to which pressure is applied, wherein a thickness of the waist portion in the cross section is set such that a falling angle of the lip portion due to the pressing force is uniform in a longitudinal direction. 2. The wiper blade rubber according to claim 1, wherein the thickness of the waist portion is set thicker in a region where the pressing force is high in accordance with a longitudinal pressure distribution of the pressing force, and The wiper blade rubber is characterized in that the region where the pressure is low is set thin. 3. The wiper blade rubber according to claim 2, wherein the first area where the pressing force is high, the third area where the pressing force is low, and the third area are arranged in the longitudinal direction according to the pressure distribution. 1
And a second region where the pressing force is located between the third region and the third region, and the thickness of the waist is reduced by the pressing force in the first and third regions. The wiper blade rubber is formed with a constant thickness corresponding to the first region and the thickness is gradually reduced from the first region to the third region in the second region. 4. A wiper blade comprising the wiper blade rubber according to claim 1. 5. A wiper blade rubber for wiping a glass surface is held by a lever assembly constituted by a plurality of levers rotatably connected to each other, and the lever assembly is connected to a tip of a wiper arm. In the wiper blade applied to the wiper blade rubber as a pressing force on the glass surface side via the lever assembly, the lever assembly has a plurality of claw portions holding the wiper blade rubber in a longitudinal direction of the rubber. The wiper blade rubber includes a lip portion for wiping the glass surface, and a waist portion having a cross section gradually narrowed toward the lip portion, In a predetermined region between the waist portions, the thickness of the waist in the cross section is set to be smaller than the thickness of the claw portion. Wiper blade according to claim.